Well I could always sent to perodua to skim the brake disc (claim warranty). But it will happen again and again until one time you realize that your time wasted on skimming the disc. Of course, they will change the disc eventually right? and the circle goes on.
There are slight improvement in shorter stopping distance and the braking is a bit smoother.
But then again, it doesn't solve the situation where you need to press the brake pedal deeper when braking as well as the spongy feeling. Which I found that it is quite annoying. Because I did drive cars like Saga BLM and I just love the sensitivity of the brake pedal.